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Soil Water Monitoring Using Geophysical Techniques : Development and Applications in Agriculture and Water Resources Management

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Soil Water Monitoring Using Geophysical Techniques : Development and Applications in Agriculture and Water Resources Management UC Berkeley Technical Completion Reports Title Soil water monitoring using geophysical techniques : development and applications in agriculture and water resources management Permalink https://escholarship.org/uc/item/2zw1t2gp Author Rubin, Yoram Publication Date 2003-10-01 eScholarship.org Powered by the California Digital Library University of California WRC Project W-929 Soil Water Monitoring Using Geophysical Techniques: Development and Applications in Agriculture and Water Resources Management Technical Completion Report Submitted 2003 Principal Investigator: Yoram Rubin Dept. of Civil and Environmental Engineering U.C. Berkeley CA, 94720 Phone: (510) 642-2282 e-mail: [email protected] Technical Completion Report W-929 Soil water monitoring using geophysical techniques: Development and applications in agriculture and water resources management ABSTRACT Monitoring of soil water content is a vital component for agricultural and ecological programs, and the key component for rational water resources management. The information obtained from monitoring is critical for optimizing crop yields, achieving high irrigation efficiencies, planning irrigation scheduling, and minimizing lost yield due to waterlogging and salinization. Such water content monitoring is also important for addressing issues of water quantity and quality, both relevant for managing the environmental impacts of irrigated agriculture and for protecting functional ecosystems. Water content information is also needed for a variety of other scientific investigations, such as climate change, environmental remediation, and engineering investigations. There are currently no techniques available to yield information about soil heterogeneities and water content at both the resolution and spatial coverage needed to assist in many subsurface problems, and in particular, vineyard management. We investigated the applicability of a surface based geophysical tool, Ground-Penetrating Radar (GPR), for estimating soil water content under both controlled and natural field conditions. Our studies focused on use of travel time data obtained from both the ground wave and from the reflected wave of the GPR signal. Our research shows that GPR groundwave techniques offer an accurate, quick, and reliable approach for estimating shallow (top 20 cm of soil surface) soil water content in very high resolution and in a non-invasive manner, and we recommend further development of this approach for use as a field tool (i.e., technology transfer). Investigations using the reflected component of the GPR signal suggests that accurate estimates of water content can be obtained using this approach when the depth to the reflector is known. More work is necessary to assess the accuracy and feasibility of the GPR reflection approach under natural field conditions. 1. Introduction and Problem Statement Monitoring of soil water content is a vital component for agricultural and ecological programs, and the key component for rational water resources management. The information obtained from monitoring is critical for optimizing crop yields, achieving high irrigation efficiencies, planning irrigation scheduling, and minimizing lost yield due to waterlogging and salinization. Such water content monitoring is also important for addressing issues of water quantity and quality, both relevant for managing the environmental impacts of irrigated agriculture and for protecting functional ecosystems. Leaching of agrochemicals and salts into the groundwater and downstream ecosystems, for example, can be minimized if irrigation water infiltrates only to the bottom of the root zone. High resolution, continuous water content distributions allow one to design optimal irrigation and chemical application programs that make possible such “prevention at the source.” No current technique can provide such information quickly, reliably, and at low cost. Our funded proposal focused on investigating the applicability a surface geophysical method, ground penetrating radar (GPR), for use as a water content estimation tool; development of such a tool could lead to increased water savings and better control on the ecology of natural vegetation. Our proposal called for careful development and application of GPR data acquisition and inversion techniques under a variety of hydrological/geological conditions. Preliminary experiments that we had conducted at the Richmond Field Station using surface GPR proved very promising; these results are briefly reviewed in Section 3.1. Using funding from this project, we have continued to explore the potential and limitations of GPR methods for water content estimation under both controlled and natural heterogeneity conditions. These studies have illuminated the potential of using GPR to estimate moisture content or changes in moisture content as well as the obstacles that need to be overcome in order for this method to be developed into a reliable field tool. Section 3.2 presents results from extended investigation at the Richmond Field Station test pits, where we have tested the GPR methods under varied but controlled hydrological conditions. Analysis of these data suggested that GPR methods can provide reliable soil moisture content estimates under a variety of saturation conditions. We have also developed a field site at the Robert Mondavi Winery in Napa, CA, as discussed in Section 3.2. At this site, we investigated the potential and limitation of GPR groundwave methods under natural conditions. We chose to initially develop this technique for use in the vineyards because these grapes are high-cash crops, and because precision vineyard management is emerging as a realistic and beneficial approach for the California vineyards. Successful development of GPR methods for vineyard management will naturally encourage experimentation of the technology within other crops as well. 2. Objectives Our research objectives can be described by the following tasks: 1) Acquisition: Investigation of optimal acquisition and inversion methods for ground wave and reflected GPR travel time information under different field moisture conditions. 2) Survey Analysis and Development of Interpretation Methods: This task entailed field data calibration, development of the petrophysical relationships needed to transfer the geophysical measurements into water content or soil type, and development to the geophysical data analysis procedures. This task was the key component in the research, and analysis is focused on travel time and amplitude of both ground wave and reflected wave events. 3) Validation: Comparison of soil water content point estimates obtained from GPR data with co-located measurements from available from conventional tools such as gravimetric, neutron probe, time-domain reflectometry, and soil textural analysis techniques indicated the viability of this method as a reliable and efficient water- content field tool. 4) Geostatistical Analysis: Comparison of water content spatial correlation structure obtained from GPR data with correlation structure obtained from conventional moisture content/soil texture measurement techniques as well as remote sensing over space and season. 5) Comparisons between GPR-, plant- and airborne-based measurements; assessing the utility for GPR within precision farming practices: This task entailed comparison of point and spatial correlation estimates of water content/soil texture, obtained from GPR, with plant and remote sensing information (collected by our NASA collaborators) that are currently being used to guide vineyard farming operations. 3. Procedures and Research Results Investigations of the use of GPR reflected and groundwaves for near subsurface water content estimation were performed under both controlled and natural conditions. We investigated the use of GPR travel time data by analyzing both GPR ground and reflected wave events. Figure 1 provides a simplified illustration of the typical energy arrivals recorded by the GPR receiving antenna (RX) from a transmitting antenna (TX), including the path that the energy takes in air between the transmitter and receiver, the path of the ground wave travelling in the near subsurface along the air-ground interface, and the path of the reflected event from an interface between materials having different dielectric constant (κ) values. The most rapid acquisition mode of GPR data is the common offset mode. With this mode, the transmitter and receiver are kept a fixed distance apart, as shown by the 'S' in Figure 1, and the entire unit is pulled along the ground surface. By analyzing the travel time of the GPR signal and by knowing the length of the travel path, estimates of velocity and subsequently dielectric constant can be obtained, which can then be translated into estimates of water content. Below we describe experiments performed to assess the accuracy and feasibility of GPR approaches for water content estimation under both controlled and natural conditions. 3.1 Controlled Pit Experiment at the Richmond Field Station: A Review. We performed a study at the Richmond Field Station in Richmond, California during 1998 to test the feasibility of using surface GPR to estimate sub-asphalt moisture content under controlled conditions (Grote et al., 1999; Grote et al., 2002). As this experiment served as an impetus for current research, we briefly review the experiment and results here. At this site, a 1.5m deep pit was built and filled with clean, compacted sand. During filling, gravimetric moisture content, TDR, and
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